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    <title>ES6/ES2015核心内容（上）</title>
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<a href="https://segmentfault.com/a/1190000004365693" target="_blank">ES6/ES2015核心内容（上）</a>
<ul>
    <li>
        let 块级作用域  var （全局作用域 函数作用域）
    </li>
</ul>

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    <button class="clickbox">Button6</button>
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    <button class="clickboxs">Button</button>
    <button class="clickboxs">Button2</button>
    <button class="clickboxs">Button3</button>
    <button class="clickboxs">Button4</button>
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